reapplying

First time creating an account and posting, I've frequently lurked the popular threads here. As per the title, I'm very discouraged (putting it mildly!) and looking for some support or advice, or just a second opinion from another perspective (especially reapplicants and those more experienced)...

Hi all, I am in third year and planning to reapply to a number of firms I applied to last year. I had both a vac scheme this summer and summer internship (same company as in years prior) so I do have new experiences. My query is how much I should be changing my applications from the previous...